Pump casing



FIG. 1 is a perspective view of a pump casing showing my new design;

FIG. 2 is a front view thereof, the rear view being a mirror imagethereof;

FIG. 3 is a left view thereof, the right view being a mirror imagethereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The ornamental design for a pump casing, as shown and described.